Captured on camera ... three people caught abusing a female commuter aboard the bus. Photo: YouTube

The bus was a rail replacement running on the regular Frankston line from Mordialloc to Caulfield about 10.30pm on Sunday, November 11.

Mr Nayna said it was worrying how the abusers fed off each other and became a mob.

"It didn't make any sense. There was no logic," he said.

"It was just weird mob mentality. They were feeding off each other and breaking off into rants and encouraging each other over some racist stuff — it was like a bonding session."

Mr Nayna, who has light-brown skin, said at one point he tried to stop the fracas but he was also abused with a rant about how black people should sit at the back of the bus.

Another passenger offered one of the abusers his fishing knife and gave him a beer.

"Then he went off on a tangent about filleting people and saying 'They're just scared c---- at the back of the bus," Mr Nayna said.

Mr Nayna said Victoria Police had contacted him about the footage and would speak to them later on Wednesday.

He said he had uploaded the footage to shame those involved and who were featured in the video into realising what they had done.

"I don't care about these people, I feel like they can reap what they sow, so good luck to them, but what I'd prefer to do is ... show how embarrassing it is and get people talking about that maybe racism is a problem," Mr Nayna said.

"I want those people to see it and hopefully it will change the way they think by being shamed.

"There were just a lot of scared faces and confusion ... there was just no sense to be made of it."

The video has had more than 300,000 views on YouTube and has drawn attention of media outlets across the world.

In 2010, three men were the first in Victoria charged with inciting racial hatred, accused of verbally and physically assaulting an Indian man on a bus between Frankston and Rye. All three had charges against them dropped last year.